White LCD Screen

[Zac]

The white screen issue is very unlikely to be the LCD itself, but we need some more debugging to track it down.

My first guess is that the LCD ribbon itself isn't properly seated or that the ribbon socket shoulders aren't fully latched in place.  I know this is a poor video, but watch this to make sure it's being inserted/locked properly.  https://www.youtube.com/watch?v=sch5ZW1idz4

Does the green LED come on when you hold the power on for 10 seconds?

Are you able to hook up to HDMI with a monitor/TV?  If so, what do you see on the TV?

Are you using a brightness controller?  If so, there's a chance that it is causing the problem.  Can you disconnect it (just leave it hang from the 2 wires for a moment) and just connect the LCD straight to the Freeplay CM3 board?

Did you ever disconnect the Raspberry Pi Compute Module 3 (green board) from the Freeplay CM3 (red board)?  If so, it may not be fully seated.  I can find a video about that if you need it.

Hey, I've been having pretty much identical problems, I was also having wierd flickers across the screen with colours and then it was working fine.
One morning tried turning it on and I just got the white screen.
At first I couldnt get the green light to stay on, I took it apart to make sure the ribbon hasnt slipped out of place, no such luck fixing it
I formatted the SD scard thinking that might be it, again no such luck
However I can get the green light to stay on, still a white screen.

I went to the shops today to buy a mini HDMI. Everything boots up normally on the screen.

Any ideas? maybe the LCD itself or somehow the ribbon got damaged?